Browsing School of Physics by Author "GALLAGHER, PETER THOMAS"
Now showing items 1-16 of 16
-
Automatic detection and tracking of coronal mass ejections. II. Multiscale filtering of coronagraph images
GALLAGHER, PETER THOMAS (2012)Studying CMEs in coronagraph data can be challenging due to their diffuse structure and transient nature, and user-specific biases may be introduced through visual inspection of the images. The large amount of data available ... -
A Bayesian approach to comparing theoretic models to observational data: A case study from solar flare physics
GALLAGHER, PETER THOMAS (2011)Solar flares are large-scale releases of energy in the solar atmosphere, which are characterized by rapid changes in the hydrodynamic properties of plasma from the photosphere to the corona. Solar physicists have typically ... -
Coronal mass ejection mass, energy, and force estimates using STEREO
MC ATEER, ROBERT THOMAS JAMES; GALLAGHER, PETER THOMAS (2012)Understanding coronal mass ejection (CME) energetics and dynamics has been a long-standing problem, and although previous observational estimates have been made, such studies have been hindered by large uncertainties in ... -
Eclipse observations of high-frequency oscillations in active region coronal loops
GALLAGHER, PETER THOMAS (EDP Sciences, 2003)One of the mechanisms proposed for heating the corona above solar active regions is the damping of magnetohydrodynamic (MHD) waves. Continuing on previous work, we provide observational evidence for the existence of ... -
Evidence for internal tether-cutting in a flare/coronal mass ejection observed by Messenger, Rhessi, and Stereo
MC ATEER, ROBERT THOMAS JAMES; GALLAGHER, PETER THOMAS (2010)The relationship between eruptive flares and coronal mass ejections (CMEs) is a topic of ongoing debate, especially regarding the possibility of a common initiation mechanism. We studied the kinematic and hydrodynamic ... -
HELIO The Heliophysics Integrated Observatory
GALLAGHER, PETER THOMAS (2011)Heliophysics is a new research field that explores the Sun-Solar System Connection; it requires the joint exploitation of solar, heliospheric, magnetospheric and ionospheric observations. HELIO, the Heliophysics Integrated ... -
Investigating the driving mechanisms of coronal mass ejections
GALLAGHER, PETER THOMAS; RAFTERY, CLAIRE LOUISE (ESO, 2010)Aims. The objective of this study was to examine the kinematics of coronal mass ejections (CMEs) using EUV and coronagraph images, and to make a quantitative comparison with a number of theoretical models. One particular ... -
LEMUR: Large European Module for solar Ultraviolet Research. European contribution to JAXA's Solar-C mission
GALLAGHER, PETER THOMAS (2012)Understanding the solar outer atmosphere requires concerted, simultaneous solar observations from the visible to the vacuum ultraviolet (VUV) and soft X-rays, at high spatial resolution (between 0.1" and 0.3"), at high ... -
Multi-wavelength observations and modelling of a canonical solar flare
GALLAGHER, PETER THOMAS (ESO, 2009)Aims. We investigate the temporal evolution of temperature, emission measure, energy loss, and velocity in a C-class solar flare from both observational and theoretical perspectives. Methods. The properties of the flare ... -
An observational overview of solar flares
GALLAGHER, PETER THOMAS (2011)We present an overview of solar flares and associated phenomena,drawing upon a wide range of observational data primarily from the RHESSI era. Following an introductory discussion and overview of the status of observational ... -
Observations of Low Frequency Solar Radio Bursts from the Rosse Solar-Terrestrial Observatory
MC ATEER, ROBERT THOMAS JAMES; GALLAGHER, PETER THOMAS (2012)The Rosse Solar-Terrestrial Observatory (RSTO; www.rosseobservatory.ie) was established at Birr Castle, Co. Offaly, Ireland (53?05'38.9'', 7?55'12.7'') in 2010 to study solar radio bursts and the response of the Earth?s ... -
On the 3-D reconstruction of Coronal Mass Ejections using coronagraph data
MC ATEER, ROBERT THOMAS JAMES; GALLAGHER, PETER THOMAS (Copernicus Publications, 2010)Coronal Mass ejections (CMEs) are enormous eruptions of magnetized plasma expelled from the Sun into the interplanetary space, over the course of hours to days. They can create major disturbances in the interplanetary ... -
Search for 1-10 Hz Modulations in Coronal Emission with SECIS during the August 11, 1999 Eclipse
GALLAGHER, PETER THOMAS (EDP Sciences, 2004)Results of the search of the periodic changes of the 530.3 nm line intensity emitted by selected structures of the solar corona in the frequency range 1-10 Hz are presented. A set of 12 728 images of the section of the ... -
Solar Magnetic Feature Detection and Tracking for Space Weather Monitoring
BLOOMFIELD, SHAUN; GALLAGHER, PETER THOMAS; MC ATEER, ROBERT THOMAS JAMES (2011)We present an automated system for detecting, tracking, and cataloging emerging active regions throughout their evolution and decay using SOHO Michelson Doppler Interferometer (MDI) magnetograms. The SolarMonitor Active ... -
Towards Reliable Benchmarking of Solar Flare Forecasting Methods
BLOOMFIELD, DAVID SHAUN; HIGGINS, PAUL A; MC ATEER, ROBERT THOMAS JAMES; GALLAGHER, PETER THOMAS (2012)Solar flares occur in complex sunspot groups, but it remains unclear how the probability of pro- ducing a flare of a given magnitude relates to the characteristics of the sunspot group. Here, we use Geostationary Operational ... -
The wave properties of coronal bright fronts observed using SDO/AIA
GALLAGHER, PETER THOMAS (2011)Coronal bright fronts (CBFs) are large scale wavefronts that propagate though the solar corona at hundreds of kilometers per second. While their kinemat- ics have been studied in detail, many questions remain regarding the ...